Behaviour of Tritium and Tritiogenic Helium in Freshwater Lens Groundwater Systems: Insights from Langeoog Island, Germany

Figure 3

(a) Chloride concentration, (b, c) ³H concentration, and (d) ³He concentration as a function of depth for observation well 17. The small red square marker symbols in (a) indicate the chloride concentration calculated from the downhole log. Round symbol markers in (a), (c), and (d) represent samples collected in 2013 (previously published by Houben et al. [7]); square symbol markers are for the samples from well 17. Crosshair symbols in (b) are data for January 2002 from Marggraf [30]. The displayed samples are from different wells within 300 m of the model cross section. The solid lines represent the model outcomes (discussed later on) of simulations A7-A9; the dashed lines are for simulation A7 with longitudinal dispersivity . See Figure 1(b) for the location of observation well 17 and Figure 10 for its projected location on the modelled cross section.